Manure to Energy Byproducts are Useful Nutrient Sources

Abstract

Manure is a great fertilizer for nutrient-poor soils. However, when transport costs limit utilization, alternative uses such as energy production become viable. In most cases, manure-to-energy practices produce nutrient-rich byproducts that can be used as a soil amendment. While nitrogen (N) may be lost, other nutrients like phosphorus (P) and potassium (K) are often more concentrated in these byproducts. Manure-to-energy practices include anaerobic digestion and thermal methods (pyrolysis, gasification). Composting and nutrient extraction also can alter manure and help concentrate nutrients for easier and less costly transport. All of these practices are discussed in another publication: Manure as a Natural Resource (EB-420).